Nicola Sturgeon's resignation was a surprise to many in politics - but the events that have unfolded since she left office have come as even more of a shock.
Four months after her resignation, which she insisted was "not a reaction to short-term pressures", the former first minister has been arrested as part of an investigation into SNP funding and finances.
Police Scotland said on Sunday that she is in custody and being quizzed by detectives.
