Who would want to kill a nun? That was the problem facing Inspector C.D. Sloan of the Berebury CID when the body of Sister Anne was found at the foot of the cellar steps at the Convent of St Anselm. Sloan soon found that interviewing half a hundred black-habited sisters as potential suspects for murder was no easy task - especially when he realised that, to him, one nun looked very much like the next, and every sister had an assumed name - and a past...

It's December 1810, and Lady Therese Osbaldestone is looking forward to her usual Christmas with her family at Winslow Abbey, her youngest daughter Celia's home. But then a carriage rolls up and disgorges Celia's three oldest children. Their father has contracted mumps, and their mother has sent the three - Jamie, George, and Lottie - to spend this Christmas with their grandmama in Little Moseley.

Brighton, 1950: When the body of a girl is found, cut into three, Detective Inspector Edgar Stephens is reminded of a magic trick: the Zig Zag Girl. The inventor of the trick, Max Mephisto, is an old friend of Edgar's. They served together in the war as part of a shadowy unit called the Magic Men. Max is still on the circuit, touring seaside towns in the company of ventriloquists, sword-swallowers, and dancing girls.

It's a perfectly normal day for Kitt Hartley at her job at the University of the Vale of York library, until Detective Inspector Halloran arrives at her desk to tell her that her best friend, Evie Bowes, is under suspicion of murder. Evie's ex-boyfriend Owen has been found dead - with a fountain pen stabbed through his heart - and all the evidence points to her. Kitt knows there is no way Evie could murder anyone - let alone Owen, whom she adored. 

Lady Emily Hardcastle is an eccentric widow with a secret past. Florence Armstrong, her maid and confidante, is an expert in martial arts. The year is 1908 and they've just moved from London to the country, hoping for a quiet life. But it is not long before Lady Hardcastle is forced out of her self-imposed retirement. There's a dead body in the woods, and the police are on the wrong scent. Lady Hardcastle makes some enquiries of her own, and it seems she knows a surprising amount about crime investigation...