"Mandragora" written by David McRobbie.

M A N D R A G O R A
David McRobbie's Mandragora (Mammoth Australia) is another contemporary novel with links to a historic shipwreck, the sinking of the Dunarling. Adam and Catriona have found a cache of four small dolls made from mandrake roots. The dolls were left in the cave by two other teenagers, Jamie and Margaret, who had survived the wreck of the Dunarling. Transcribing a diary from that same voyage, Adam and Catriona learn the power of the cursed mandrake roots, power that destroyed the Dunarling in 1886 and that is resurfacing in the town of Dunarling today.
Chapter One…